It occurs when the head is suddenly forced backward or forward and is then snapped in the other direction.

Now they were forced backward as the soldiers shoved their way into the room, finally drawing their swords.

Ned blocked it easily and Steve was forced backward by the force of the collision.

Forced backward and forward in her memory, she lost track of time.

Bigfang was forced backward until one foot went into the fire.

Harry shouted, trying to follow, but a heavy branch whipped lethally through the air and he was forced backward again.

Palermo simply allowed himself to be forced backward across the room.

And slowly, step by step, Hazel was forced backward.

But step by step he had been forced backward toward belief.

Hand and wrist were forced backward in a lightning-swift arc.